John Ahearn, born circa 1830, Coastguard, and Louisa O'Boyle, of Ballina, Mayo

I am looking for relatives and information of the Ahearn family tree.One of our Ahearn's was given a medal by the Queen of England for his naval accomplishments.Some of the others were merchants. They had 8 children, Mary Anne Ahearn (1864), James Ahearn (1865) who married Mary B.Muffany in 1893 and had 12 children, John Ahearn (1867), Henry Ahearn (1869), Louisa Jane Ahearn (1870) and married Michael Durkan, Eugene Ahearn (1873), Bridget Ahearn (1875), and Andrew Ahearn (1877).I am the granddaughter of Louisa Jane.Any information is greatly appreciated.